Several unspecified cross-site scripting (XSS) vulnerabilities and a
well hidden SQL injection vulnerability were found. An XSS attack
allows an attacker to insert malicious code into a web-based
application. SquirrelMail does not check for code when parsing
variables received via the URL query string.

Impact

One of the XSS vulnerabilities could be exploited by an attacker to
steal cookie-based authentication credentials from the user's browser.
The SQL injection issue could potentially be used by an attacker to run
arbitrary SQL commands inside the SquirrelMail database with privileges
of the SquirrelMail database user.

Workaround

There is no known workaround at this time. All users are advised to
upgrade to version 1.4.3_rc1 or higher of SquirrelMail.

Errata
======
The original version of this Security Advisory listed the vulnerable
versions incorrectly. Whereas the original GLSA listed vulnerable versions
as "<= 1.4.2" it should have in fact been listed as "< 1.4.3_rc1". The
corrected "Affected Packages" section appears below.